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Effect of interface roughness on magnetic multilayers of Fe/Tb and Fe/Cr

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DOI: 10.1016/S0304-8853(01)00912-X
PII: S0304-8853(01)00912-X
Copyright © 2001 Published by Elsevier Science B.V. All rights reserved.

Amitesh Paul ^,

Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany

Available online 24 October 2001.

The effect of systematic variation in the correlated interface roughness on perpendicular magnetic anisotropy (PMA) and giant magnetoresistance (GMR) has been studied in Fe/Tb and Fe/Cr multilayer systems, respectively. Multilayers for each system were deposited simultaneously on a set of float glass substrates pretreated with varying rms surface roughness. In both the systems the amount of intermixing at the interfaces and other morphological parameters are found similar, thus allowing one to separate out the effect of interface roughness only. X-ray reflectivity, diffuse scattering, conversion electron Möbauer spectroscopy and superconducting quantum interference device magnetometry are used to characterise the systems. With the increase in , the PMA in Fe/Tb as well as the GMR in Fe/Cr shows a small decrease. The observed effects are mainly due to the changes in the correlated part of the roughness of the multilayers, while the uncorrelated part of the of different multilayers are expected to remain similar.

PACS classification codes: 75.70-i; 68.35Ct

1. Introduction
2. Experimental details
3. Results and discussion 3.1. Fe/Tb MLs 3.2. Fe/Cr MLs
Acknowledgements
References

(15K)
Fig. 1. XRR scans of [Fe(3.0 nm)/Tb(2.0 nm)]_×20 multilayers along with their fit deposited on FG substrates with different etching times. The substrate roughness (

_s) and interface roughness (

_i) are shown. The inset shows the transverse (

) scan for S1 along with the fit at two different angles of

corresponding to the position at the Bragg peak and at an off-set to it. At

_¯

the specular peak is seen over a diffuse background. For clarity, various curves are shifted relative to each other along the y-axis.

(6K)
Fig. 2. The plot of surface roughness of the FG substrates and the corresponding GMR ratio as obtained from the fit to the XRR data and the magnetoresistance measured. The arrows indicate the points for variation maximum/minimum in roughness/GMR.

(5K)
Fig. 3. The change in AFF (

) with increase in substrate roughness as obtained from SQUID measurements. Also shown is the GMR normalised to AFF (

) with increasing roughness.

Subject View:

1. A. Gupta, R. Amitesh Paul, D.K. Gupta, G. Avasthi, Principi, J. Phys. Condes. Mater. 10 (1998) 9669 and references therein.

2. A. Gupta, Amitesh Paul, S.M. Chaudhari, D.M. Phase, J. Phys. Soc. Jpn. 69 (2000) 2182 and references therein.

3. Amitesh Paul, A.Gupta, J. Alloys Compounds 2001, in press.

4. D.E. Savage, J. Kleiner, N. Schimke, Y.H. Phang, T. Jankowski, J. Jacobs, R. Kariotis and M.G. Lagalley J. Appl. Phys. 69 (1991), p. 1411. Abstract-INSPEC | $Order Document | Full-text via CrossRef
D.K.G. de Boer Phys. Rev. B 49 (1994), p. 5817. Abstract-INSPEC | $Order Document | Full-text via CrossRef

5. R.A. Brand Nucl. Instrum. and Methods B 28 (1987), p. 398. Abstract-INSPEC | Abstract-Compendex | $Order Document

6. R. Schad, P. Beliën, G. Verbanck, V.V. Moshchalkov, Y. Bruynseraede, H. Fisher, S. Lefebvre and M. Bessiere Phys. Rev. B 59 (1999), p. 1242. Abstract-INSPEC | $Order Document | Full-text via CrossRef | APS full text

7. L.G. Parratt, Phys. Rev. (1954) 359.

8. A. Gupta, Amitesh Paul, S.Mukhopadhyay, Ko Mibu, J. Appl. Phys. 2001, in press.

9. Amitesh Paul, Ajay Gupta, Prasanna Shah, K. Kawaguchi, Hyperfine Interaction 2001, in press.

10. A. Amitesh Paul, S.M. Gupta and D.M. Chaudhari , Phase. Vacuum 60 (2001), p. 401.

Fax: +49-2461-61-4443; email: a.paul@fz-juelich.de

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